Pulley



Sept. 8, 1942. w. E. AKER 2,294,951

PULLEY Filed Jan. 2, 1941 s Sheets-Sheet 1 hi/mi E 15 Wm W. E. BAKERSept. '8, 1942.

PULLEY s Sheets-Sheet: 2

Filed Jan. 2,- 1941 P 1942- w. E. BAKER 2,294,951

PULLEY Filed Jan. 2, 1941 3 Sheets-Sheet 3 Patented Sept. 8, 1942-PULLEY William E. Baker, Chlckasha, Okla, asslgnor of one-third toAlbert L. 'Baker and Sylvia May Baker, both of Chickasha, Okla.

Application January 2, 1941, Serial No. 372,911

4 Claims.

This invention relates to an improved speed govemingTpulley adapted todrive or be driven by a V-belt and connected to .a shaft for drivingsaid shaft and/or for being driven thereby, and provided with means forlimiting the speed of rotation of the belt or for limiting the speed ofrotation of the pulley.

More particularly, it is an aim of the invention to provide a speedgoverning pulley for use on generators and alternators ofmotor vehiclesfor preventing the armature shafts thereof from being driven atexcessive speed.

Still another aim of the invention is to providea pulley especiallyadapted for use on alternators of motor vehicles used for supplyingalternating current to loud speakers and other electrical devices havingmeans for governing the speed of rotation of the armature shaft of thealternator to cause it to be driven at a uniform speed to therebyprevent the alternating and voltage of the current from varying when thespeed of rotation of the main drive shaft pulley varies.

More particularly, it is an object of the invention to provide a novelconstruction of pulley for V-belts having flanges for normally engagingthe belt, one of said flanges being arranged to yield away from theother flange, means forming a part of the pulley and disposed betweenthe flanges and arranged to turn freely relatively thereto, for engagingthe belt when the, flanges are spread to permit the belt to move withgreater speed than the pulley.

Other objects and advantages of the invention will hereinafter becomemore fully apparent from the following description ofthe drawings, whichpartly in elevation, of the same taken substan- ,tially along the planeof the line 34 of Figure 1.

Figures 4 and 5 are transverse sectional views, on a reduced scale,taken substantially along the second form of the pulley, takensubstantially along the plane of the line 1-1 of Figure 6,

Figure 8 is a sectional view taken substantially along the plane of theline 8-8 of Figure 7.

Referring more particularly to the drawings, wherein like referencecharacters designate like .or corresponding parts throughout. thedifferent views, Figure 1 illustrates one application of the inventionwherein Ill designates generally an internal combustion engine of amotor vehicle having a crankshaft ll provided with a pulley l2 fordriving a V-belt I3 which belt is'trained over pulleys I4, l5 and I 6for driving said last mentioned pulleys. Pulley i4 is keyed to thearmature shaft of a current alternator, not shown, which is adapted tofurnish alternating current to a loud speaker or other alternatelycurrent appliances associated with the vehicle, not shown, which isdriven by the engine ID, the pulley I5 is keyed to the armature shaft llof a conventional generator [8 and the pulley I6 is keyed to the drivenshaft 19 of the water pump of the,

engine. It is to be understood that the pulleys I4 and I5, which areconstructed in accordance with the invention, may be used for variouspower transmitting means and may be connected either to a driven ordriving shaft and that the application of the pulleys, as illustrated inFigure 1 is only intended to illustrate one application for which theinvention is adapted.

The pulleys l4 and I5, each of which is constructed in accordance withthe invention may be constructed either in accordance with the inventionas disclosed in Figures 2 to 5 or in the other form as shown in Figures6 to 8. Assuming that the pulley I5 is of the form shown in Figures 2 to5, the pulley, designated generally l5, as best seen in Figure 3,includes a hub, designated gen erally 20, which is adapted to'engage theshaft I1 and which is provided with a, longitudinally disposed groove 21which opens into the bore 2; thereof for engaging a .key 23 which issecured to the shaft I! for keying the pulley l5 thereto.

The pulley I5 is provided with a flange 24 which is formed integral withthe hub 20 and which projects outwardly therefrom adjacent the inner endthereof. The hub 20 is provided with planes of the lines 4-4 and 55,respectively,

of Figure 3,

Figure 6 is an end view in elevation of another form of the pulley,

Figure 7 is a view similar to Figure 3 of the an externally'threadedintermediate portion 25 which, as illustrated, is provided with a lefthand thread and a restricted threaded portion 26, at

its outer end, which is provided with a right hand thread.

,The pulley I5 is provided with a second flangewhich is internallythreaded for engaging the threads of the portion 25 for mounting theflange 21 on the hub 20. The flanges 24 and 21 are provided, adjacenttheir outer edges, with the inner opposed faces 29 which divergeoutwardly. The converging inner portions of the faces 29 are offsetinwardly of the adjacent sides 39 of the flanges 24 and 21 to form theinwardly facing shoulders 3|.

A plurality of ball bearings 32 are mounted in a cage 33 and aredisposed around the ring portion 29 which is provided with an annulargroove 34 in its outer side in which the ball bearings 32 seat and whichforms an inner race for the ball bearings. A ring member 35, forming anouter race, and which is disposed around the ball bearings 32 and race33, is provided with an annular groove 35 on its inner side,corresponding to the groove 34 and in which the ball bearings 32 areadapted to engage. The ball bearings and cage and the ring member 35 aredisposed between the sides 30, which are substantially parallel to oneanother, and the race member 35 is of a width slightly less than thenormal space between the sides 30 and is disposed with its sideedges'arranged within and slightly spaced from the shoulders 3i. Theouter side of the race or ring member 35 combines with the faces 29 ofthe flanges 24 and 21 to form the V-pulley l over which is adapted to betrained the V-belt l3.

A nut 31 is provided with a threaded bore for engaging the threadedportion 28 of the hub and is provided with an annular recess 38 whichopens toward the outer side of the flange 21 and which extends toadjacent the annular periphery 39 of the nut 31. As best seen in Figure2, the periphery 39 is provided with a plurality of circumferentiallyspaced slots 40 which open outwardly of the inner, free edge of theperiphery 39 and which are disposed obliquely thereto and which extendinwardly of the periphery 39 in a direction corresponding to thedirection in which the nut 31 is turned for tightening it on thethreaded portion and in a direction opposite to that in which the flange21 is turned for screwing it down on the threaded portion 25. The slots40 are provided with enlarged offset openings 4|. The flange 21 isprovided with an opening 42 which extends transversely therethrough andwhich opens into the space between the race members 28 and 35. A strandof relatively heavygage resilient wire 43, as best seen in Figure 4, iscoiled substantially one and onehalf times within the recess 39 and isprovided with an end 44 which projects laterally from the recess 38 andthrough the opening 42. The strand 43 is provided with an oppositecurved outwardly projecting end 45 which is adapted to be insertedthrough one of the slots 49 for engaging the opening thereof, as bestseen in Figures 3 and 4. The outer end of the armature shaft i1 isthreaded, as seen at 46, for receiving a nut 41 which forms a lock nutfor engaging against the outer side of the nut 31 for holding it inposition when screwed down onto the threaded portion 23 of the hub 20.Nut 41 also retains the pulley l5 in a-position on shaft l1 so that itsgroove 2i will engage the key 23.

Assuming that the pulley i5 is assembled, as seen in Figure 3, and thatthe belt i3 is turning so as to turn the pulley in a clockwisedirection,

. as seen in Figure 5, the flanges 24 and 21 are normally spaced so thatthe complementary sides 43 of the belt l3 will frictionally engage thefaces 29 and be held out of engagement with the outer side of the ringmember 35 so that the frictional engagement of the belt l3 with thefaces 29 will turn the pulley for revolving the shaft l1. It will benoted that the pulley II will thus be driven in a direction to tend tounscrew the flange 21 from the threaded-portion 25 of the hub 20.However, the resilient wire 43, the end of which is anchored in anopening 4! will yieldably hold the flange 21 to prevent it from beingunscrewed by the pull of the belt i3 until the speed of the belt l3increases to a point so that the back pull or resistance to rotation ofthe shaft l1 will overcome the resistance of the spring wire 43 topermit the belt l3 to turn the flange 21 relatively to the hub 20 tomove it away from the flange 24 to cause the belt i3 to engage the ringor race member 35 which, being mounted to rotate freely relatively tothe flanges 24 and 21, will permit the belt l3 to slide relatively tothe flanges. Of course, as soon as the belt I3 begins to sliderelatively to the flange 21 it will no longer frictionally engage theface 29 thereof so that the tension of the spring wire 43 will turn theflange 21 in the opposite direction for screwing it back down onto theportion 25 for returning it too. position to frictionally engage thebelt l3. In this manner, regardless of thespeed with which the belt '15moving the shaft l1 and pulley l5 will not be driven faster than acertain speed governed by the tension of the spring wire 43. The tensionof the spring wire 43 can be varied by positioning its end 45 indfierent openings 4! and by turning the nut relatively to the flange 21to either increase or decrease the tension of the spring wire 43 toincrease or decrease, respectively, the speed at which the armatureshaft l1 can be revolved by the belt l3.

Obviously, the pulley l5 could be mounted on a driving shaft instead ofon a driven shaft, in

which case the pulley would act to limit the speed at which the beltcould be driven regardless of the speed at which the driven shaft mightbe revolving so that the belt could not be driven beyond a certain speedirrespective of the fact that the driving shaft might be revolving at agreater speed.

Figures 6, 7 and 8 illustrate another embodiment of the pulley,designated generally l5 which could obviously be substituted for eitheror both of', the pulleys I4 and IS in Figure 1. The pulley is isprovided with a hub 49 adapted to be disposed on an armature shaft I1and having 'a groove 50 opening into the bore thereof for engaging a key23' on the shaft i1 for keying the pulley i5 to the shaft 11'. The hub49 is provided with an integral flange 5!, adjacent its inner end. Thehub 49 is also provided with an enlarged annular portion 52 whichprojects outwardly from the side 53 of the flange 5i toward the outerend of the hub 49 and the outer side of which is provided with anannular groove 54 forming an inner race for ball bearings and cage 32and 33', respectively, which are -=-mounted therearound. The pulley l5also includes a second flange 55 which is disposed on the outer flange55 to turn slightly relatively to the hub 43.

The pin and opening connection 51, 56 slidably connects the flange 55 tothe hub 49 so that the flange 55 can slide toward and away from theflange and will be caused to revolve therewith when the pin 51 is inengagement with the opening 56. V a

The flanges 5| and 55 are provided with inner faces 29 corresponding tothe faces 29 and forming the shoulders 3|" corresponding to theshoulders 3|. A portion of the side 59 of the flange 55 is disposed inopposed, substantially parallel relationship to the side 53 and betweensaid sides is disposed the ball bearings 32' and cage 33. A ring or racemember 60 having an annular inwardly opening groove 6| is disposedbetween the sides 53 and 58 and around the ball bearings 32' whichengage the groove 6| and within the shoulders 3|.

The annular portion 52 is provided with an annular outwardly openinggroove 62. The flange 55 is' provided at its outer side with an annularrestricted portion 63 which opens outwardly of the outer side thereofand the flange 55 is also provided with an annular inwardly projectingrib 64. A yieldable member 65, preferably of rubber. is disposed aroundthe portion '56 of the hub 49 and is provided with a portion 61 toengage the groove 62 and having an annular outwardly opening groove 68for receiving the rib The inner side of the resilient member 65 seats inthe recess '63and is attached to the flange 55 by the rib and grooveconnection 64 and 68, respectively.

The outer end of the hub portion 66 is threaded to receive a nut 69 anda washer i disposed in front of the nut 69 for bearing against the outerside of the resilient member 65 for urging it and the flange 55 towardthe flange 5| and the hub portion 52. The outer end of the shaft I1 isthreaded at 46' to receive a nut 41' for retaining the pulley l5 inposition on the shaft l1 and with its screw 50 engaging the key 23'.

From the foregoing it will be obvious that the operation of the pulleyI5 is the same as that of the pulley l5. Assuming that the pulley I5 isbeing driven in a clockwise direction by the belt '13, as seen inFigure6, or-the belt l3 may be revolving in the opposite direction for turningthe pulley counterclockwise, as the pulley |5 will function in the samemanner regardless of which direction it is driven, the yieldable member65 will urge the flange 55 toward the flange 5| for causing the faces29' to frictionally engage the faces 48' of the belt l3 for driving thepulley. When the speed of rotation of the belt I3 is increasedsufliciently to increase the back pull or resistance of the shaftsufliciently to overcome the tension on the flange 55, produced by theresilient member 65, flange 55 will slide outwardly of the hub 49 andaway from theflange 5| to permit the belt l3 to engage the race member60 and to release it from frictional engagement with the sides or facesso that the belt l3 can slide freely relatively to the pulley ber 65will urge the flange 55 back. toward the flange 5| so that the faces 29will frictionally engage the faces 48" and in this manner the pulley l5will be prevented from being driven faster than a certain speed.

The nut 69 can be tightened to increase the pressure of the resilientmember 65 so that greater back pressure or resistance of the shaft IIwill be necessary to move the flange 55 outwardly to thereby enable thepulley I5 and shaft H to be driven at a greater speed or the speed atwhich the shaft I1 and pulley l5 may be driven can be reduced byscrewing the nut 59 back on the threaded end of the portion 66 to reducethe pressure exerted by the resilient member 65 against the flange 55for producing the opposite result.

Various modifications and changes are contemplated and may obviously beresorted to as only a preferred embodiment of the inventionhas beendisclosed.

I claim as my invention:

1. A, speed governing V-pulley over which a V-belt is adapted to betrained, said pulley including a hub having a flange adjacent its innerend, said hub having an intermediate threaded portion, a flange having athreaded bore for, engaging said threaded portion, said flanges havingopposed outwardly flared sides for engaging sides of the V-belt, saidbelt being adapted to turn in a direction for unscrewing th lastmentioned flange from the hub to move it away from the other flange, amember mounted on the outer end of the hub and detachably securedthereto, and a coil spring wound around a portion of said member andhaving one end detachably anchored thereto and its opposite end anchoredin the last mentioned flange to turn therewith, said spring being undertension and being woundin,

a direction to urge the last mentioned flange to turn in a direction,opposite to the direction in which it is rotated by the belt.

2. A pulley as in claim 1, the outer end of the hub being threaded inthe opposite diie.:tion to its intermediate threaded portion, saidmembercomprising a nut for threadily engaging the outer end of the hub.

3. A pulley as in claim 1, and anti-friction means turnably mounted inthe pulley'and disposed between the flanges and inwardly of the faces,engaged by the belt, for supporting the belt when the second mentionedflange is moved away from the first mentioned flange.

4. A pulley as in claim 1, said member comprising a disk having aninwardly opening annular recess in which the spring is wound, theperiphery of the disk having a plurality of notches for selectivelyreceiving the first mentioned end of the spring for selectivelytensioning the spring, said notches opening outwardly of the inner edgeof the periphery of the disk.

WILLIAM E. BAKER.

